21116105 has 8 divisors (see below), whose sum is σ = 25397064. Its totient is φ = 16854400.

The previous prime is 21116099. The next prime is 21116119. The reversal of 21116105 is 50161112.

It can be written as a sum of positive squares in 4 ways, for example, as 440896 + 20675209 = 664^2 + 4547^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21116105 - 2¹² = 21112009 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2276 + ... + 6885.

It is an arithmetic number, because the mean of its divisors is an integer number (3174633).

Almost surely, 2^21116105 is an apocalyptic number.

It is an amenable number.

21116105 is a deficient number, since it is larger than the sum of its proper divisors (4280959).

21116105 is an equidigital number, since it uses as much as digits as its factorization.

21116105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9627.

The product of its (nonzero) digits is 60, while the sum is 17.

The square root of 21116105 is about 4595.2263273967. The cubic root of 21116105 is about 276.3999356693.

Adding to 21116105 its reverse (50161112), we get a palindrome (71277217).

The spelling of 21116105 in words is "twenty-one million, one hundred sixteen thousand, one hundred five".